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8076188: Optimize arraycopy out for non escaping destination

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If the destination of an arraycopy is non escaping, the arraycopy may be optimized out

Reviewed-by: kvn, vlivanov
This commit is contained in:
Roland Westrelin 2015-05-12 10:27:50 +02:00
parent 3dc9461bc8
commit a9cdbd0407
17 changed files with 1224 additions and 486 deletions
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18
hotspot/src/share/vm/opto/arraycopynode.cpp
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@ -30,7 +30,9 @@ ArrayCopyNode::ArrayCopyNode(Compile* C, bool alloc_tightly_coupled)
: CallNode(arraycopy_type(), NULL, TypeRawPtr::BOTTOM),
_alloc_tightly_coupled(alloc_tightly_coupled),
_kind(None),
_arguments_validated(false) {
_arguments_validated(false),
_src_type(TypeOopPtr::BOTTOM),
_dest_type(TypeOopPtr::BOTTOM) {
init_class_id(Class_ArrayCopy);
init_flags(Flag_is_macro);
C->add_macro_node(this);
@ -595,3 +597,17 @@ Node *ArrayCopyNode::Ideal(PhaseGVN *phase, bool can_reshape) {
return mem;
}
bool ArrayCopyNode::may_modify(const TypeOopPtr *t_oop, PhaseTransform *phase) {
const TypeOopPtr* dest_t = phase->type(in(ArrayCopyNode::Dest))->is_oopptr();
assert(!dest_t->is_known_instance() || _dest_type->is_known_instance(), "result of EA not recorded");
const TypeOopPtr* src_t = phase->type(in(ArrayCopyNode::Src))->is_oopptr();
assert(!src_t->is_known_instance() || _src_type->is_known_instance(), "result of EA not recorded");
if (_dest_type != TypeOopPtr::BOTTOM || t_oop->is_known_instance()) {
assert(_dest_type == TypeOopPtr::BOTTOM || _dest_type->is_known_instance(), "result of EA is known instance");
return t_oop->instance_id() == _dest_type->instance_id();
}
return CallNode::may_modify_arraycopy_helper(dest_t, t_oop, phase);
}